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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a4924e1dca9e731876607c4c5076abd8d4ebb7aa9bf4d3c251f93ee42309e6' 
  AND token = 'bGEE9zIRIptnhwYov7Z70Drg/xGxp6YpXf+V29FVvb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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