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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a692e9b41477c71b70b531ca91ff1e7c9a2cb9b583de808b2d9c013db97b77f6' 
  AND token = 'ihJyg1yJFAev1aj7UGLZT8hGNRkp/TuQWwpKQw8ynbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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