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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8923a9f1dd1d0562d1225ddc2cc983a31fc96de74d238ec83c0dc23df8a693' 
  AND token = '7/MDN/T9aZpc6xM+WD9tGt0eqwTracaBV22F0/Wqly0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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