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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93c6c7de8f1a68694fe7b9a38932bff521cb85bf19c1c3aa2493b5189c74a99' 
  AND token = 'g4A41nWaENZvAF41MyrXdL5pgd+V0/0AjtwIVCtoiF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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