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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828b3a827d14a0e63251e6d3015af08f4d103a28d4efbb5db3d19adc91685aaf' 
  AND token = '5aHO8lV6qd+ogTOkaAo+a5N7CyKEw/opxlPBACb3xJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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