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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5805e4437b63614d37b7369f4416a88404b8cf97fd57c3513c89390fcb41b676' 
  AND token = '9YKsgonPkM8kLizM73DnkoFnAtqY+ETo5Gx5+JYARmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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