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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7ca90320df44f3b1ea048a4a94140bfe1aa5d06c289862da0598a1207bbc07' 
  AND token = 'jjksUneNBMgEvj4n7VYN3uhLdLndD+czyHen3A7TNWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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