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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c911c086c8e9bde5f76d2e42379e52bf0e32641baba2e96b549b6cee336e16' 
  AND token = 'e/nhlaQXZDxicE7KN99bzMum1k9AHKLTq2blQ0VlnBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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