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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9807e64de38c6f68a5c83e53fd1129b6d7ce98371bdb93cba132fe0e0b996601' 
  AND token = 'I4Fw4yKGKEq6v4eP4iEggE/bcF/iLMoemqvxEB3gjiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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