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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b421dd70295f8b0abd53b2940eb9170d28536f3a18eb349ca333ce51a193efff' 
  AND token = 'QfTk2EN91pHAtedHLw5UFC4ej0K4KSYdRhEK2xNFd48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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