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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3b3b6805322f41fea24c8f06c5f9266658dea4fdcb901071179246f1b8d253' 
  AND token = '4WhsnQsHk6+KT8xTyl8Je7mWjOl3AFFMLHIIBDNSKtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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