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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c972c5d5fa57b004609fb3fce958d64cbc6e968775f0242b1b4cc7a0136aa1' 
  AND token = '5cPeL0AtqJ1UCeZYlBUon8k0KB6Vy2KKyGy5ztycrLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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