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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1c165be79e1f991546a7d10d2ab5111c257892aae766bfc2b4956957aedfa6' 
  AND token = '/Q0HPhlso3Y97rPKy89NSRD+KA4SM+tnZxjtL+Op1Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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