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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eec8c15452e9715b9a175c46fc0a8b2be41a681c472d2343090622a21450b04' 
  AND token = 'b9JZLA2MtE0UR1ZI2E8h/p9ild/v4+NobCGKr6Dgoe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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