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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13798cea44721a93d15d40da7d9427e8fb2f050a4fe6902f07b5d2c927e86d17' 
  AND token = '5cW4/55gjszxIbDa06lN1q7TU6/BqGOqCIuaiOjkHkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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