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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f783e70560243416ad9291027bfe5c2ade9f44ad19b6368073359cbc324d833' 
  AND token = 'kvWI70k80fSzTvHCH5GKuDsgT5c0mZuye5YxPxtb7Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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