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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19f6bd8d96b17f151ce33b19ea455e6867564af37b1fa10f134b8abc8ee1de1' 
  AND token = '5DT/enbsqoCjcXl/hqdzo7SVrkOPh7BrVlmXO6fWEOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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