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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c90ec50486c0b41793338a155f77234134c9860adf625b562fe35ab1665e0e' 
  AND token = 'lqa090JVCm0D1BdLHWZ2URlHPenfv3nICfO9CfL+Qi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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