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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91ec874b04a6b2bf48c987533c47a701ac930c2533869c078a101048d264e82' 
  AND token = 'dqIVem2prbgDJwlyJcFoQ4u5Z2Sqw4tONY5033DGvN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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