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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03fd2d93beb6092223d0aac3f583db548f2cbaa25d0d19794d16b11ac7d60e69' 
  AND token = '5Gg/Z9cb7mw5FsXhI9CsLyEPDv/+/pbUC02NxIuTA/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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