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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718e2caf3231497221ad306608e631ef69508443f92f1e4b0483a82d9866bc19' 
  AND token = 'FURRtBUPqwzo9/z9wb8tpRFDg4qqltRumsU5ats8f9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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