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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9922e5ae72c1e8f97273fc55ba28ad9a4ddc21dbf785cf4caf8c5aa1ed238045' 
  AND token = 'BKvuAx/0uWi4vpP2NsOncTyhXcGOF+E42liw/aBFxMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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