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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5488e86ce0dd908f0c925cb3e6b3782a404564a787e7f6d6e3f1ed7c01a2842f' 
  AND token = 'N4FCCo1twPFgmfK3MPlAsvSsXN5zF3HcaZwCEoB7bos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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