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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7fa7e1923e2d1868fa8659cb2e4a8093ccc596896af567c94c139cf2cfe8e06' 
  AND token = 'D+wEoxHmkBSzkl3dX740ULQwrqBwORE+BUk9A9sFG/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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