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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d5015ebac9cc714bf39a01c23109b47813cf144e186466225ec7c08371bb24' 
  AND token = 'SD4yKk5WlfZkHh664TQj0HlmVcpQZ4OIp4rk/VYKH9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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