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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009e21acec8a5d3883dfd64fb100b2415b8e9ac96f79e0f9f95e97144c4c36c3' 
  AND token = 'SNX8K0umkMBFKgCpnBLvElSvNaEKMPKMJYYVTECf8u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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