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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b345ceab0608c8ed44290f94a7a3dda0b67dc4f718b4320afeec94e36507a96' 
  AND token = '6YIo/8swC1UMAkjA4sHQLunRJvaOnMXl5ZQa9xRUrLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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