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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ce58f8d0b4058a17813cfd4b0364e278df2fadcaa97da97c77c65ee2d3e314' 
  AND token = 'lNXFXfHFK7V5CLHcnTzdSQQIQUrSud9z9fereoQXal8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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