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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7be9946a391e7ccc513b150c0264ab563e55458ac0e0c0892f1eb6069404763' 
  AND token = '0tYixZS5I0HTie2rAXri9gRTTxTeBp/rRwz51AdgYes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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