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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8911881d82f82c19ec43e58aad744bd350d10909c01b05316fcff401c46346' 
  AND token = 'JgCt9vk1M9Afb/HU8J02vKmKahp4Wn70osa875HhgJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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