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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3ff0c6a4422e5cf4656c87faeecc41be1bdf261ec6f913fa53a5fa4514336c' 
  AND token = '9/4b/0D37B56oycuzNW/HGZdD0Ijxe+J85pSt0BEoVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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