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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7eb48f93738987ae30d91ce1a20535515baa222f143a7f414517941c408215' 
  AND token = 'cEVEXr1PNwgA8WUcradA7Yhwx8kzwlNTSSjg7Nyqr5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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