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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac149a74f9eb0f6013c141894a7fbe198d3e7b83ef847cbb15ea520c1e6f0e1' 
  AND token = 'PkcuQokCxegwaJZaLt4rIFssci8s+YmWcafmeMKZ1CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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