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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '805cf4f7182c7ba26b7ce0848e7db7f9ec2e8191777ce2edbdc4ea4a634fb551' 
  AND token = 'A8y695308gRLL3VmrXf4XXKGnmZ7jH0aUdPHR+HNbvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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