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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d414fa66045243879f1ab5288bd07e364bec3dd75064098c74fe3e2210526be' 
  AND token = 'bsOIX58AsZaM1IS9eqZRuyA5aICgPXryOklShRflED4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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