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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70dd6255405765ccabf412dec6ae786cc66ba22ff933610640cc97a414592eb5' 
  AND token = 'LorS5IRRT1EDXgLyq39rNtT+6adCJbPP2XDPtsFj674=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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