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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e8ca9700b43b3b569e113bf995616bab51a1509eee5f8a15e861c2843797c7' 
  AND token = 'kyLJcWib1Aibkwa20ntucQiSY2LWcr80aBJ72EPyWls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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