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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd906ee8e6d2f308e835273133652823a3d90ea1f32f389afdf9d591dc2837269' 
  AND token = 'U9vBbfr4DHd6AYqpQiX2Sr2uq0MX4luuBU7Bli60nyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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