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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a24c48ff3b47a6cf2f760f4f76359b641035f3c7dfab34d1acfc105c584eb8d' 
  AND token = 'fEqyuxnRW2nkuEOCR4o6Khirfj7tT9YLAiMdtPfxk9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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