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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7d15750054ad0b1a016f3d7d9ae74f9190c22342345702b85469c562cd3636' 
  AND token = 'NApOTYXPdb0df0yoaxQEzPN8atwPEqpb5JJ+bDAbzl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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