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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a6047f5487edaacfa2bcc6c2f56324b6ef06bef571c6253f1412e1173a76a40' 
  AND token = 'QdivItTVsdhQoaaKYpmqB20WH87GtC9TAMxRmK1ka1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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