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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d309d7074ef4e58f874bf4896307a6d594616b540a067c1cd9c9163893cb1b4' 
  AND token = '0MdSuQuRdt9Z3EhlHratBwAlVk70VMF/MNm1a9JLRZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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