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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0babef9a86eff795a1f47902c039b3e9448b3c38cb1fb3edad19f7d2b8ee388f' 
  AND token = 'Zm1Hi5tlOrCneJyPD41zr7W0aIlr0pYEGqS0pNCn1Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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