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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f165e42c89e6f27a6b0aa8996946903bd0bf7cc168d0389ac5766798b32cf23' 
  AND token = 'JeX70WPEU87PshHWJ3XCkSJs+LjtCtUh+mjhMV/tIfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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