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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d61b5c1b600ddd6079ea88c35a92a423623fbc59ee0f797914e05cb3aa1072' 
  AND token = 'qLJoOzcoqpubjSBICw3FXt4jeUNkGWx/xXvOsSI5tIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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