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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf76f5265ac2eab473beb4d1b8af3981fa575e085298496aefba128661920ab' 
  AND token = '9ZKpgatkn/3meV1muXSa4SfDb/vcPiiuH0zwdH34cKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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