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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab74454c154f6b730865d51649a4de026fba672d14091fbc66300a1fe79a8f6' 
  AND token = 'X8OlTx0JjXdJ810dFRapBJ1mrv7xI4YC0PcEdNaBx70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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