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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acbea4d1b085f4a9a6ba7e7cb729a58b30205aa92113f07b8fc7428a19fb8518' 
  AND token = 'UcdxoDxyBcPsjMjhk4JzQ6rGUOXQVsXCbnUIPbqdeJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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