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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eda24a28e521ebfe48e35e649fb1174d4ccc11be7fc72044164e41ea34fee8e' 
  AND token = 'XGg6UtLrEwz8k8QJDJpvPkHxX9P5B0DcMBumHNVqqBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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