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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9b1dfe3f140ccb8088b99ca2a412ac76d8c189511cecacd781f25fc95b46c4' 
  AND token = 'ZSSFWyt4N2+zhSAe1erCtAwLOBWniaqTtk3t1gk0/8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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