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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bab4c095a08c10bf829ecbfffbd5476867b76268c95441895e14c86950d7b90' 
  AND token = 'oTGYaR/s5SYoLzP/j9mXXI2YdN8KKrdLxV1sGFmTxPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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