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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61d64a587097f13dd39385064e0b50bf751a1261cf74d5a3b55b5f99441bee3' 
  AND token = 'hGDfFpoVrLDIkB/r5tqLiWqyHdY2Q20pot4uus4pQiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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