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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79f5d57d6fdc8fcb50377f6684e8df9561ddd42146548250eeae3e162fd0d92' 
  AND token = 'ti8MOI2Kt8icl54tq560NWxfhnp3Xx5HDOlUB4tY2Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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