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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3704023a648bb1c268b08ecb78a1b880c4f876317152cc4a9c9fe4fb07d13ca1' 
  AND token = 'rozKqE0CVI2pc0oQCnAEy9i98MrNXsCF3QZuOP+jf7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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