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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a7d9ab640a8be41f43ad870c5e3166dc02c00139b6f2a58a899f323fb68e42' 
  AND token = '/HU8d4AA4Hyux+K69jmN5hijSgzvVT+HI4WdqkMIWnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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