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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19b5b8c82b984d85b592514b22450c11fc4bfc437738f9cdc29c9ac46cc7ab8' 
  AND token = 'JzbekJs2AztVrekSskM8xC4SfLDEZxCILw/SStuD6hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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