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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1990cea6d093473c19d0b6cdc15bd93d3601f67f716d5c592f80f6bb791df2' 
  AND token = 'y5eoZZFhFoVXxrR+Ak/ypABBWuy+vccd65X0zZHRN1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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