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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea5af9825eafa74f52a0665cfcc913b58f31c7173d2f501fdebfd2f318dc5fa' 
  AND token = 'pvwgt5QD54DBzvRoODmwSTWtZLloT7HyHjoAIiY6En4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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