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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf9a80f85924fa688ac2f53fd2252ce016ed0923bc3c70a5f924b4df8db530e' 
  AND token = '7Vlv9WTJExyhbusAMpipdd4sUIz7l9GZCCVLSO9MtfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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