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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00929d1131a25feaa2de9aa5c65c88040696b6170e1d319b0ccf8e2ca13bcfe4' 
  AND token = 'cfORi9tD4lUU5+8Sz8ohkOKnHJQ9reGYZ0gpQ5GxidE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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