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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76fa5241a25dba1f120c7439374a423f6804f3986ba4b512d373e7f9dc74c2f' 
  AND token = 'XoSoPo3dJtiiu8a4i6q+Q0h7V1y2JXpXA8s4FzU5BUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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