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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19ea0f8a5d3ecedfa374abc0c20ea0be8d7370122b220141a5d412a5747aea0' 
  AND token = 'en88343fy0XZYwtb60Tf5lqT8s8ZMBwj/cWD4iZ3+jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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