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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab4c0bc4cfcf80dca99b15cb588238e2db7f077a576c7eb4044a21d49ed044f' 
  AND token = 'rvIIdCF4afwAWlvr6CXNnt2TUNW0ECcpvmn/25QsnKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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