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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a791da1ca90ec44eb2156ead7e0dbf7bce1d1850821958fd78b31b3a0419463c' 
  AND token = '7NN3ZMD9KtbZSpBKMbsq6jj7EIV4uQLi/KNFlVYxnCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}