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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc9af143634e796f92de4b5b48145fc3b491c8464aee883ae33faeaf30be9f2' 
  AND token = 'MrpFuzaOwsgDKIJOdmil6Am+sL8uC4RlEJCNxFk1vCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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